Cisco Systems 611 manual Power Source Interruptions

Appendix C Maintaining the Cisco Wide Area Application Engine

Maintaining Your Site Environment

Power Source Interruptions

Systems are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage, undervoltage, and transients (or spikes) can erase data from memory or even cause components to fail. To protect against these types of problems, power cables should always be properly grounded and one or both of the following methods should be used:

•Use one of the power protection devices described in the “Using Power Protection Devices” section on page C-7.

•Place the system on a dedicated power circuit (rather than sharing a circuit with other heavy electrical equipment). In general, do not allow the system to share a circuit with any of the following:

–Copier machines

–Air conditioners

–Vacuum cleaners

–Space heaters

–Power tools

–Teletype machines

–Adding machines

–Laser printers

–Facsimile machines

–Any other motorized equipment

Besides these appliances, the greatest threats to a system’s supply of power are surges or blackouts caused by electrical storms. Whenever possible, turn off the system and any peripherals and unplug them from their power sources during thunderstorms.

If a blackout occurs—even a temporary one—while the system is turned on, turn off the system immediately and disconnect it from the electrical outlet. Leaving the system on may cause problems when the power is restored; all other appliances left on in the area can create large voltage spikes that can damage the system.

	Cisco Wide Area Application Engine 511 and 611 Hardware Installation Guide
C-6	OL-7220-02